#include <stdio.h>
int main() {
	int arr[] = { 1,2,3,4,5,6,7,8,9,10,11,12,13 };
	int i = 0;
	for (i = 0; i <= 13; i++) {
		if (i % 2 == 0) {
			printf("%d\n", arr[i]);

		}
	}
}